Lighting fixture



Dgc. 14 .1926.

E. A. BULL LIGHTING FIXTURE Filed April 18. 1923 A further object of the invention is the light, the arrangement being such th'at the Fig. 1; is a..;verti cal= section onfthe line" 1 Fig. 2is a' front elevation of the device;

of Fig. 1.

post, such as are commonly'employed'ior street lights; 2 is the source of'light;f3.is

. i I Got the form of a generated curve substan- Patented Dec; 14, 1926.}

E WIN A. BULL; or

LIGHTING Application filed April 18,

provision in such alighting fixture-of a diffusing reflector for all raysto be reflected from the source of light and a diffusing rcfractor for all direct raysflfronrthe source to the objects tobe illuminated thereby.

Another and further object oftheinvention is the provision" in such a lighting fixture of a, reflector and a diffusing member having located therebetw-een a source of source of light cannot be removedv Withoutv disassembling the parts,r;whereby theftot the light source is prevented.

I accomplish the above and} other objects of the invention by, means of I a structure such as is shownin'theaccompanying drawings,'inwhich 11 of Fig.2;

Fig. 3 is a ho izontal sectiononlihe 3 3 In the drawings, in. which similar ri V --eucecharacters indicate ,siinilareleinents in all the figures, 1 indicatesthe .llghting fix tu're support, here'shown inthe form of a the reflector; 4 the diffusing glassprotector and5 is an auxiliary sourceoflight.

As sh0wn,-the reflectorn3-is of general concave curvature in verticalsectionaand"of double curvature in'horizontaL section,ceach half of the latter curvature having a'portion tially that of a truncated parabola, the space between the outer surfacer7 of the reflector I and the reentrant portion Sbeing for a puri pose hereinafter tobe set forth.

Y convex to the source oflightwhich is situ ated substantially in the planeofthe edge i -porting postfin anyzdesired manner,- but preferably and as hereshown, thereentra-nt portions have integrally formed therewith a;- V ale-encumber it which surrounds. d pose] portions.

' same. as shown atlt)v and '11 in Fi 1.v ro

, V g I The edge'portions of the reflector'are continuous with the parabolic curves 6 andare- Thereflector extends above and below. tie "source of light and forwardly of the cHIcAco', ILLiNO IS j I TUR 192 3. ea-am. 632,956.

ividing flat'plates through whichithe holding i rods12 for-the difl'using glass protector 4 extend. Thisdittusing protector is made of alba glass or similarpdifi'using materialand,

- as shown, is preferably in three sections hav-' ing copper strips-joining their adjacent the .purposeof diffrisingall direct rays .of

. light from the source and, because of. its; location and extent with relation to'the light 1 source and the reflector, also prevents'the reinoval' ozt'rthe lamp from its socket/As shown. in Fig. 3, the diflusin-g and protect- 1 ing elements surround at least one-halt 0f the'lamp constitutingthe. light source and till edges 'to- .which the holdingrodszv 12 are I soldered. This diiiusingv protectorserves thus, in connection'with the reentrantpor- 'tion of the reflector, prevent the removal of. the lamp when these parts are properly lo-' cated in their operative positions;

As an additional. means for holding the diffusing protector "to the reflector, a spring catch 15 or alock maybe employed. 1

The reflector is-inade of suitable material having'its'innersurface white fire enameled, therebydifl'usingthe light. from: the source .which impinges upon it and is reflected, thereby. As. shown in Fig; 3, the shape. of the reflector is such'thatthe rays impinging upon the'reentrant portion -are reflected by itjfar' to -the sides of. thereflector, while" those which impinge upon the'parabolic por-i tions aredirected'in substantially parallel f directions' and those which impinge" upon the convex portions are reflected in;pathsbctween the two .p'rev'iously-referredto sets'of rays. The reentrantportion of the reflector 3 is so, shaped that the extreme. rays therefrom will be substantizillyfilSO degrees apart.

Practically none of the reflected rays pass through the diffusing element, thus prevent-.

light from the source is thereforeuniformly ingl any unduelossof light. Those rays "Wl110l1 pass directly to. *thef'diflusi'ng element a 43 are"refracted and diflused thereby; Tlhe 0 I distributed inoa horizontal direction across a field of substantially '180 degrees and all ingelement, nodirect'unmodified rays prothe rays are reflected or retracted by a 'difius- I I I r ceeding' from the light source to the objects to be 'illuminatedtherebv.

The. reflector may be fastened to the sup-: 7

The reflector may also be providedwith an integral upwardly extending portion which 'provldes a-housing auxiliary light and also an attachingdevice for the socket for the for the globe for this light. y v The space between the surface 7 of the reflector and the reentrant portion 8 provides a passageway for the cable which extends to the auxiliary light 5. As an ob-, vious modification, the socket for the main source of light Lmight be at the upper por tion of the fixture, inhwhich instance, the cable for this light would extend "through the passageway referred to, and no auxiliary light would be provided for.

vInstead of mounting the fixture upon a post, the reflector element might be pros Vvided with vertically backwardly extending portions atthe outer edges thereof constitut ing areentrant portion of sharp'curvature and two similar symmetrically arrangedw ,SlClG portions, the radlus t curvature oi each side portion increasing from the reent-rant portion outward for'the greaterporti'onnot its extent with an outer edge portion of reverse curvature, of a source'o't light locatedin front of saidreentrant portion substantially in the plane of the edge portions.

partially surrounding said source, and a diffusing reflector consisting-oftwo similar Jortions unmetricall 1 arran ed with respcct to'the source otlight and meeting at a point dlrectly behind said source and presenting'to the source continuous reflecting curves'wlnch cause the rays returnedtherer by to pass to the sides or said source of light and said diffusing screen without'impinging thereon.

' 3. The combination with a'lamp, of a diffusing reflector cons sting of two similar" segment-s symmetrically arranged with 1 reless lateral ei ztentthan said reflector,

spect tothe lamp andimeeting a't a point directly behind the said lamp and a ilitl'using element directly in front of said lamp of i the space betweenthe sides of the diiiusing ment and the reflector being less than diameter ofthe lamp while permitting passage therethrough of all reflected ra t; The combination with a source of light, of a reflector consisting of two similar-portions symmetrically arranged wit-h respect to the source of light and meetiz at a point directly behind said source of light, constithe tuting a reentzant portion, and an aur zniarv source of ht located above said first mentioned source of light and said reflector and power conducting means forsaid auxiliary source of i ght located in the space provided by said rcentrant portion 5. The combination with source of light,

of a diffusing reflector located intherear of said source of light, aid reflector being concave in vertical section and of double curvature in horizontal section, the outer vertical portion of said reflector being convex to the source of light. 1

6.7 The combination with a source of light, of a diffusing reflector located in the rear of said source of light, said reflector being'concave in vertical ection'andof double curve: ture'in horizontal section, the outer vertical portionot said reflector being convex to the source of light, and a diffusing refractor lothe ele-

' cated in front ofsaid source of light-rand tached to said reflector; saidretractor being i of less lateral extent than saidrellector,-the

spaces at the sides therebetween being'l'ess V i than the diameter of the source of light,

2. The combination with a source of light, of a difitusingscreen located in front of and 7. The combination witha retlector having a reentrant portion of sharp curvature and two similar symmetrically arranged side portions, the radius of curvatureot' each side portion increasing from the reentrantpor- 1 tion outward and having an outer edge portion of reverse curvaturaof a light source situated in front of s. d reentrant portion, I the curvature of the reflector beingsuch that the raysdrom-the light source reflected thereby are direct-ed away from the source of light."

In testimony whereof, I 'afiix my signature. 7

" EDWIN-A. urn 

